[frio] Increase available width for shared content
[frio] Increase available width for shared content

- Added a bottom margin to the shared header
- Removed padding and horizontal margins for the shared content

tobiasd/friendica,annando/friendica,annando/friendica,tobiasd/friendica,friendica/friendica,friendica/friendica,friendica/friendica,fabrixxm/friendica,friendica/friendica,fabrixxm/friendica,annando/friendica,friendica/friendica,fabrixxm/friendica,annando/friendica,tobiasd/friendica,tobiasd/friendica,annando/friendica,tobiasd/friendica,fabrixxm/friendica,fabrixxm/friendica